So that's £833 per month.
Currently my outgoings excluding housing are:
Utilities 120 (and I wfh so am already at home all day).
CT 160 (assuming I didn't get a discount on this)
Food & cat food, household cleaning stuff etc 250
Other bills like Netflix, contents insurance, etc 80
So a total of £610, so that would leave me £220 for anything else. If I got CT relief it could be more. So yes, I could do it and already do to an extent. The rest of my earnings goes to savings/holidays/clothes/house stuff etc.
I'm in SH so no repairs to worry about. Live in London and don't have a car and get a free oyster card at 60. It wouldn't be a luxurious life. The holidays and what not would have to go. But I wouldn't be struggling and would have some money for the odd meal out, hobbies (mine are cheap) gifts etc.
The state pension is £230 p/w, which is £11,960 per year. So on my current costs, I'd be left with £4640 a year for anything else. That's a reasonably healthy budget. Could afford a cheap holiday, replace a broken appliance, a few new clothes and some days out.